Backpack



FIG. 1 is a perspective view of a backpack showing our design.

FIG. 2 is a front elevational view of the backpack of FIG. 1.

FIG. 3 is a rear elevational view of the backpack of FIG. 1.

FIG. 4 is a left-side elevational view of the backpack of FIG. 1.

FIG. 5 is a right-side elevational view of the backpack of FIG. 1.

FIG. 6 is a top plan view of the backpack of FIG. 1; and,

FIG. 7 is a bottom plan view of the backpack of FIG. 1.

The broken lines in the figures show portions of the backpack that form no part of the claimed design. 

CLAIM The ornamental design for a backpack, as shown and described. 